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You can check for the existence of a module with eval:
eval "use Some::Module"; $@ && print_an_error_message_with_a_nice_link_to_cpan();

Here's another technique for using non-core modules that fits in better with the other module calls, and is able to report multiple missing modules:

#!/usr/bin/perl -w use strict; use CGI ':standard'; use_('Some::Module'); use_('Some::OtherModule'); install_modules() if %_; # if use_ fails this happens sub use_ { eval "use $_[0]"; $@ && $_{$_[0]}++; undef $@ } sub install_modules { # link to dist(s) on cpan if(keys %_ > 1){ $_ = 's' } else { $_ = '' } my $p = header; $p .= qq~Required perl module$_ not found: ~; for(keys %_){ $p .= qq~<a href='$_'>$_</a>, ~ +; } $p =~ s|, $||; print $p; exit }
Hope this helps.

Update: Cleaned it up a bit.

Check out my Perlmonks Related Scripts like framechat, reputer, and xNN.

In reply to Re: Checking for PERL Modules by epoptai
in thread Checking for PERL Modules by kidd

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